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Amphastar Pharmaceuticals (AMPH) Stock Chart & Stock Price History

Amphastar Pharmaceuticals logo
$23.78 +0.56 (+2.41%)
Closing price 10/17/2025 04:00 PM Eastern
Extended Trading
$23.78 +0.00 (+0.02%)
As of 10/17/2025 07:39 PM Eastern
Extended trading is trading that happens on electronic markets outside of regular trading hours. This is a fair market value extended hours price provided by Polygon.io. Learn more.

Amphastar Pharmaceuticals Stock Price Performance

The Amphastar Pharmaceuticals (AMPH) stock chart highlights key performance trends across multiple timeframes. Over the last 12 months, the stock's price has decreased 53.23%, with a year-to-date return of -35.95%. In the past month, the stock has decreased 13.34%, reflecting recent market activity.

As of the latest close, Amphastar Pharmaceuticals traded at $23.78 with a market cap of $1.11 billion and volume of 321,483 shares. Five years ago, the stock traded at $20.96, representing a 13.45% increase over that period. At the time, it had a market cap of $995.31 million and a volume of 125,427 shares.

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5 Day
Performance
+1.15%
1 Month
Performance
-13.34%
3 Month
Performance
+15.32%
Year-To-Date
Performance
-35.95%
1 Year
Performance
-53.23%
5 Year
Performance
+13.45%

AMPH Stock Chart for Saturday, October, 18, 2025

Amphastar Pharmaceuticals Stock Price History

DateOpening PriceClosing PriceHighLowVolumeMarket Capitalization
10/17/2025$23.22$23.78
+2.41%
$23.89$23.09321,483 shs$1.11 billion
10/16/2025$23.14$23.22
+0.35%
$23.61$22.94449,608 shs$1.08 billion
10/15/2025$23.86$23.14
-3.02%
$24.20$22.94504,306 shs$1.08 billion
10/14/2025$23.51$23.86
+1.49%
$23.98$23.33282,165 shs$1.11 billion
10/13/2025$23.63$23.51
-0.51%
$24.21$23.42324,135 shs$1.09 billion
10/10/2025$24.97$23.63
-5.37%
$25.02$23.20607,448 shs$1.10 billion
10/09/2025$25.98$24.97
-3.89%
$26.11$24.68441,557 shs$1.16 billion
10/08/2025$25.83$25.98
+0.58%
$26.32$25.57250,038 shs$1.21 billion
10/07/2025$26.58$25.83
-2.82%
$26.68$25.80390,489 shs$1.20 billion
10/06/2025$26.75$26.58
-0.64%
$27.07$26.53241,845 shs$1.24 billion
10/03/2025$26.52$26.75
+0.87%
$27.31$26.46331,099 shs$1.24 billion
10/02/2025$26.99$26.52
-1.74%
$27.03$26.46288,366 shs$1.23 billion
10/01/2025$26.65$26.99
+1.28%
$27.39$26.74337,093 shs$1.25 billion
09/30/2025$26.92$26.65
-1.00%
$27.27$26.47392,172 shs$1.24 billion
09/29/2025$26.85$26.92
+0.26%
$27.21$26.35513,361 shs$1.25 billion
09/26/2025$26.36$26.85
+1.86%
$26.92$26.34291,264 shs$1.25 billion
09/25/2025$26.87$26.36
-1.90%
$26.89$25.95565,979 shs$1.23 billion
09/24/2025$27.41$26.87
-1.97%
$27.62$26.78302,731 shs$1.25 billion
09/23/2025$27.89$27.41
-1.72%
$28.22$27.21323,932 shs$1.27 billion
09/22/2025$27.64$27.89
+0.90%
$28.24$27.61424,676 shs$1.30 billion
09/19/2025$27.44$27.64
+0.73%
$27.77$26.871.38 million shs$1.28 billion
09/18/2025$26.98$27.44
+1.70%
$27.70$26.90458,903 shs$1.28 billion
09/17/2025$27.00$26.98
-0.07%
$27.90$26.57920,909 shs$1.25 billion

This page (NASDAQ:AMPH) was last updated on 10/18/2025 by MarketBeat.com Staff
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